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L. B. RICHARDS AND C. P. WATKINS.

FURNACE.

APPLICATION FILED OCTUL l9l8 Patented July 1, 1919.

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INVENTORS lambmi 3176054772 19 U/iarles f WaZ/I'rw AT Rim .5

. tively,

LAMBERT B. RICHARDS, or SHIELDS, rEN sYL'vANm, AND

LOUISVILLE, KENTUoxY, ASSIGNOBS To TATE-JONES & PENNSYLVANIA, A coaroneTro or PENNSYLVANIA.

cHaaLns r. WATKINS, or so, me, or PITTSBURGH,

' FURNACE. 7,

To all whom it may concernr Be it known that we, LAMBER Bron- ARDS and CHARLES P. WATKINS, citizens of the United States of America, residmg at Shields, Pa, and Louisville, -Ky., respechave invented a new and useful Furnace, of which the following is a speclfication. Y

Our invention relates to furnaces of the over-fired type employed for heat treating purposes.

One of the tion, is to ena stantially even heat throu 'rincipal objects of .the invenle the maintenance of a sub: bout the heat treating chamber and particularly to provide for the heating of the lower portlon of such chamber substantially to the same ex- Y treating c tent as the heating of the upper portion'of the chamber.

Other objects of the invention are to secure the above mentioned results without affecting the contents of the heat amber, and to accomplish all of the foregoing in a simple and practlcal way:

inj uriousl Briefly stated, the invention resides in the.

combination with an over-fired furnace, embodylng upper and lower commumcatmg combustion and heating chambers, and a burner supplying heat to the combustion chamber, of an auxiliary or supplementary burner, furnishing heat directly to the heating chamber at a point remote from that supplied by the main burner and independ-.

ently regulatable to enable adjustment of the supplementary heat to the extent needed.

Other features of the invention will apgear as the s ecification proceeds andLwill c more readi y understoo from a consideration of. the accompanying drawing, wherein in one of its practical commercial forms.

In said drawing: Flgure 1 1s a transverse sectional new of an over-fired furnace having features of the invention incorporated therein.

Fig. 2 is a broken horizontal sectional view taken substantially on the plane of the line 22 of Fig. 1.

Fi 3 is a fragmentary longitudinal sectiona view of the furnace, taken substantially on the plane of the line 3-3 of Fig. 1.

Referring now to the drawing in'detail, 5 designates the upper combustion chamber, and 6 the. lower heat treating chamber, the

I I Specification of Letters Patent.

the invention embodied Patented July 1, 1919.

Application med October 7, 1918. Serial No. 257,141.

two chambers being in communication through a perforated substantially horizontally dlsposed wall or arch 7 extending transversely across between the side walls of the furnace body.

The upper or combustion chamber is provided with burner openings 8 in the side walls thereof through which the burners 9 discharge. These burners may be stagered at opposite sides of the furnace as nigicated in Fig. 1 as is customary in this a The waste products escape from the heatmg chamber in the construction illustrated, through exhaust fiues 10 extending from the bottom portion of the heatin chamber up along'the side walls ofthe furnace, these exhaust fiues also being staggered at o posite sides of the furnace as indicate Fig. 1.

With the construction thus far described, the heat generated in the combustion chamber descends through, the perforated arch into the heat treatlng chamber, the waste products escaping as above indicated from the lower portion of. said chamber. The tendency of this construction is to provide a greater degree of heat in the upper port1on of the heating chamber than in the lower portiOn thereofin other words, there 1s ordinarily somewhat of a deficiency of heat in the lower portion of said chamber. To overcome this deficiency, we have provided the supplemental or auxiliary burners 11 arranged to supply heat directly to the lower portlon of the heat treating chamber. The

eat treat1n chamber is for this purpose provided wit burner passages 12 in the oppo' site side walls thereof, referably staggered as indlcated in Fig. 1, tliese passages preferably being forked where they enter the heat- 111g chamber, as indicated at 13 in Figs. 2 and 3, to provide a baflie wall 14 for breaking up the blast from the burners. In add1t1on to the baffling efi'ect,.this forked construction of the burner passages provides inclined entry of the passage provides a further baffling effect.

- The supplemental burners 11 are preferably controllable by valves or other means, such as indicated at 15 to enable their adjustment to a point .where just enough addi tional heat will be supplied to the bottom portion of the chamber to compensate for 'the drop in temperature between the top and bottom sections of such chamber. The

. thereby subjected to substantially the same degree of heat throughout. Injury to the articles'under treatment by oxidization or the like is prevented by providing for sub stantially complete combustion of the fuel of the supplementary burners'before entering the heat treating chamber.

We claim:

1. In an overfired furnace, the c om bjru nation of an upper combustion chamber, a

opening into the lower portion thereof, and

lower heatin chamber, a perforated wall separating said chambers, 21, burner-discharging into the combustion chamber and furnishing heat to the upper part of the heating chamber through the perforated wall, and an independently controllable burner discharging into the lower portion of the heating chamber and above the floor thereof ascents for providing the supplementary heat nee essary to bring the lower part of the heating chamber to approximately the same tempera ture as the upper part of said chamber.

2. In an over-fired furnace, the combination of communicating combustion and heat treating chambers, said heat treating chamber being provided with a burner passage in the wall thereof having branches open ing directly into said chamber, a burner discharging into said assage, and an independently controllab e burner discharging burner discharging into the combustionv chamber.

4. In an over-fired furnace, an upper combustion chamber, a lower heating chamber,

a perforated wall separating said chambers,

a burner discharging into the combustion chamber and furnishing heat to the upper portion of the heating chamber through the perforated wall, said heating chamber having a'downwardly inclined burner passage an independently controlled burner discharging into said downwardl inclined passage for independently supplying heat to the lower portion of the heating chamber.

LAMBERT B. RICHARDS. CHARLES P. WATKINS. 

